Attachment_0001.docx

Qualifying Statement for BC4-25 M Grit Blaster

Name: Grit Blaster Model Number: BC4-25 M Bomb Cleaning Blast Machine-modular Manufacturer: Techniblast-Goff, Inc.

Date: 7 February 2019

Scope:

This qualifying statement covers the specifications and design requirement for the BC4-25 M Grit Blaster.

System Features:

Grit Blaster:

Blast Cabinet:

· Pass-through design blast machine to accept MCAAP’s existing monorail

· 3/8” thick manganese steel blast chamber

· (4) 25 HP direct drive blast wheels with curved blade design

· (1) 100 HP VFD variable speed controller power-flex to control blast wheel RPM of all (4) four blast wheels.

· Control panel air conditioner provided with VFD

· ½” Premium chrome replaceable cast liners in line with the blast streams on the wall opposite blast wheels.

· Blast chamber is fully cast lined with premium chrome cast liners

· Liners are designed to line up with the edge of the blast wheel housing to help protect blast wheel housing edges

· Four (4) split pneumatically powered doors located at end of both vestibules and also between blow-off and blast chamber.

· PLC controller to be located on the operator panel positioned at the grit blaster entrance

· Manufacturer must supply any bracing required to keep the two blast cabinet halves at a set distance. This bracing will be required to clear the monorail and not block any equipment from maintenance or normal operation

Spinning Mechanism:

· Two (2) powered work spinner drives rotate bombs and maintain position while in the blast zone and blow-off areas

· Drives to be equipped with a VFD for rotating speed adjustment

· A pneumatic idler adjustment arm for tension on the rotating belt.

Dual Bucket Elevator System:

· Vertically conveys the abrasive and contaminants received from the blast cabinet screw conveyor. The bucket elevator deposits the abrasive into the rotary screen to remove large debris and contaminates into a waste container. The remaining abrasive passes through the rotary screen and enters the air wash separator for final cleansing and removal of fines and broken down abrasive material. Abrasive is then discharged into the abrasive storage hopper for reuse.

· 1/8" and 3/16” thick carbon steel construction.

· Rubber-lagged head pulleys with integral shaft.

· Heavy duty pillow block bearings

· Access doors for ease of access and maintenance.

· Heavy duty shaft and bearings with shaft-mounted direct drive hollow bore reducer

· Reinforced four-ply elevator belt

· Cast malleable iron elevator buckets.

Air Wash Separator:

· The air wash separator receives the used abrasive and fine contaminants passing from the rotary screen. In a cascade fashion of a full 50" wide curtain the air wash coupled with the vacuum from the dust collector removes dust, mill scale and small abrasive fines from the abrasive operating mix.

· Waste particles are separated from the dust-laden air and fed, via a fine refuse discharge hose, to a refuse container at floor level. Lighter contaminants and dust are pneumatically conveyed to the dust collector.

· The air wash separator is to be easily accessible from the service platform for easy periodic adjustment by operator or maintenance personnel.

· Single 50” air wash Lip Separator

Abrasive Storage Hopper:

· Stores and provides a sufficient and constant and consistent supply of abrasive to supply the blast wheels. The storage hopper is equipped with a level sensor to automatically detect when a low abrasive situation is present. The level sensor automatically actuates a valve in the abrasive adder hopper to meter new abrasive into the mix.

· 3/16” thick carbon steel plate construction

· Adjustable abrasive flow to blast wheels.

Abrasive Feed Pipes:

· To provide a steady supply of abrasive media to the abrasive feed gates.

· 3” inside diameter, reinforced pure gum rubber hose.

· All feed pipes are to be mounted on the flat bottom of the abrasive storage hopper to ensure adequate level of abrasive at the outlet

Blast Wheels:

· 15” blade diameter, 8 blades, curved, 3” wide snap-lock design, made from chrome alloy and heat-treated for hardness and long-life wear.

· (4) Four Total - (4) 25 HP motors mounted in a vertical line with no offset

· 3600 RPM

· C-faced direct drive

· Direct-mounted

· Wheel Housing: 1/4” thick manganese steel, fully internally lined with premium alloy cast top and end liners.

· Impeller: conical inlet type cast of premium alloy.

· Control cage: adjustable for angular-discharge control, cast of premium alloy.

· Blades: curved blade design cast of premium chrome alloy.

· Motor lifting eye to be placed in the vertical position in relation to the finished mounted orientation so the motor can be installed/uninstalled without rotating a suspended weight.

Blow-Off system:

· To pneumatically blow the dust, abrasive and scale off of the bombs.

· The blow-off will be timer controlled to operate automatically when a bomb is present.

· The system provided will include the: compressed air pump (HP- TBD) inlet filter silencer, High velocity air nozzles (Qty TBD) to blow-down the entire length of the bombs.

· Included in the system are all plumbing piping, fittings and couplings, hoses and connectors to affix the system within the blow-off vestibule.

· This is a stand-alone compressed air motor driven system that requires no external compressed air feed.

Monorail System:

· MCAAP will provide monorail system for grit blasting operations up to the entrance of grit blaster and starting again at the exit of the machine.

· Manufacturer to provide the complete drive system.

· The chain drive system will convey the track trolley within the blaster and accept bombs from the MCAAP’s incoming monorail system to automatically move bombs through the blast machine. Required length of the chain drive to be provided by the manufacturer

· The distance between the trolleys is determined by the distance of the dog legs on the chain drive conveying system. The distance is to be provided by the manufacturer at time of the contract award.

· The distance between the dog legs needs to set at an interval to correctly space the bombs to allow the opening and closing of the powered doors in the blasting chamber area and the vestibule and air blow off chamber.

· The bombs will need to advance automatically to the next position when the cycle timer expires. Proximity switches provided by the manufacturer will be used to stop bombs in appropriate blasting or blow-off area.

· The Bombs will be fixtured onto the conveyor to be idled, rotated and blast cleaned for the set amount of time while in the blast zone.

· The bombs will then proceed to the blow-off vestibule to be rotated to remove media and debris.

Ventilation:

Requirements:

· 6,500 CFM volume at 4,000 FPM velocity@ 19” W.C. Approximately 150 linear feet of ducting with numerous elbows. All ductwork and ventilation accessories will be provided by MCAAP with the manufacturer supplying the 3 PSI rated duct from the baghouse to the isolation valve. The manufacturer will supply a suggested duct layout with all the connection points on the machine.

Abrasive Shot Trap:

· Inline drop out hopper between blast cabinet and dust collector. Captures good abrasive that has been pulled out of blast cabinet by dust collector into ductwork and prevents good abrasive from collecting in ductwork or traveling to dust collector.

· Any variance in mounting design is up for discussion.

Abrasive Classifier:

· 30” abrasive classifier to screen steel grit

· Size abrasive within a certain range based on screen sizes to be determined

· Correctly sized abrasive to be fed back to the grit blaster machine and the broken down undersized abrasive to be discharged into a waste drum.

Dust Collector:

· Donaldson-Torit Down-Flo Model-DFE 3-12/30, or similar

· NFPA 68 and NFPA 69 compliant

· Rated for 6500 CFM at 19” WC

· 30 HP backwards inclined fan blower motor

· 12 quantity ultra-web cartridge filter media

· Airflow controller has variable frequency drive

· Delta P cleaning control maintains constant static pressure

· Standard finish coat safety blue

· Clearance under hopper flange 68"

· NEMA 4 enclosure

· Pressure gauge: Photohelic

· Explosion relief panel - 34"x46"

· Extra weather guard to be provided by the manufacturer

· Leg extensions - allows clearance for isolation airlock

· Hopper drum cover w slide gate and latches

· Ground test documented

· Aluminum fan wheel

· Outlet silencer damper

· Manufacturer will supply the needed rain sleeve for a vertical exhaust fan

· 8 x 8 Airlock- NFPA 68 (venting) & NFPA 69 (isolation)

· Isolation airlock adds 24" to height of dust collector

· EcoMaxx no return valve (NRV) with locking mechanism and flanged ends with co-flanges, ATEX Certified EN 16447 micro switching for NRV Included

· Control panel with status lights- green OK/ red trouble

· Dust level sensor (capacitive) ensures NRV is not compromised

· Control panel NEMA 12 enclosure

· Motor starter for airlock to enable delay timer

· Dry set of contacts for remote Start/Stop

· Power bypass to allow operation of dust collector without blaster abrasive reclaim system in operation

Motor List:

· Full motor list including the HP and RPM to be provided by the manufacturer prior to the award in order to gauge electrical compatibility to current usage.

Service Requirements:

· 205 Full Load Amps. @ 460 v 3~ 60 Hz. Final FLA to be provided prior to the award in order to gauge electrical compatibility to current usage.

· 350 AMP breaker ( includes all Options )

Controls:

Electrical Control Panels:

· Locations for all electrical control panels and power junction boxes - TBD

· 460 volt, 3 phase, 60 cycle

· PLC controller to automatically perform, startup, operation and shut-down functions.

· Programing TBD

· Motor starters, and selector switches.

· Hour meter for recording total blasting hours.

· Fused mainline disconnect switch.

· Individual amp meter for each blast wheel

· Line fuses and over-load protection

· Pre-wired to terminal strip

· Hour meter for recording abrasive reclaim operation

· E-Stops – Locations / Programing – TBD

· Safety shut off mat at exit end of machine

Machine Electrical Wiring:

· All electrical motors and machine control devices on the machine will be completely prewired at the manufacturer’s facility to simplify installation.

· Machine wiring is terminated to a terminal strip in the control panel unless a stand-alone main control panel is used.

· MCAAP to provide wiring from junction terminals to main control panel once it is in place.

· Electrical wiring is in accordance with NEC standards.

Paint:

· The blast machine will be painted with one (1) coat vista green enamel finish coat.

· The dust collector will be Torit Donaldson blue.

Documents to be provided by manufacturer upon reward:

· One (1) maintenance/operation/spare parts manuals in notebook and on CD to be provided with the grit blaster.

· Conceptual drawings are required upon contract award along with a 3D model to verify compliance to all design requirements.

· Acceptable formats for the 3D model are SolidWorks (assembly/part) file, .step, or parasolid (.x_t)

· Final drawings to be provided showing ‘pickup points’ for venting on the blaster along with diameter sizes. All ductwork and ventilation accessories will be provided by MCAAP with the manufacturer supplying the 3 PSI rated duct from the baghouse to the isolation valve. The manufacturer will supply a suggested duct layout.

· FLA for entire grit blasting operation to be provided at award time

Design Requirements:

· The machine must be designed in modular components

· The modular pieces are restricted to the existing structure dimensions below:

· To be loaded through a 10’ x 10’ door

· Inside monorail height is 138” from the bottom beam to the floor

· Grit blaster machine must have 2’ clearance from the bottom beam of the monorail

· There is a doghouse over the pit that is the ultimate assembled height restrictions that the grit blasting machine is to fit within

· Doghouse ceiling to floor height is 21’6”

· The dog house extends 79” to the North of the main section of the pit to 26” to the South of the main section of the pit

· The dog house starts 176” to the East of the main section of the pit and runs West for the length of the building.

· The elevator must maintain 2’ of clearance along the North side of the dog house

· Main section of the pit is 26’3” (entry to exit) x 9’7”

· Main grit blaster cabinet is restricted to the main section of the pit. Any equipment using the North or South alley sections must leave OSHA approved room for maintenance personnel to conduct necessary tasks.

· Pit is 56” deep

· Centerline of the machine is 50” from the North side the pit

· The bombs are to travel East to West along the centerline of the machine

· All dimensions stated above are for reference only and are to be independently verified by the manufacturer after contract award with a site visit to the MCAAP facility. See attached sketch for clarification.

· MCAAP will provide a 3-D model of the building showing pit location with reference to the floor lay out, monorail height, expected route of duct and the baghouse placement. The file will be provided in the formats of SolidWorks (assembly/part) file, .step, and 3D PDF.

· Machine must be able to be locked out tagged out with all pneumatic doors locked out in the open position and the ventilation able to run for ease of maintenance

· Controls should be set up where the blast wheels couldn’t be energized in this circumstance.

· An E-Stop should be wired to de-energize the entire ventilation and grit blasting operation

· New machine must be compatible with the existing maintenance platforms to ensure size compatibility to the doghouse

· Blast pattern should be adjustable to accommodate various munitions of different heights and diameters

Scope of Work:

· Manufacturer will be on site to offer technical advice to the MCAAP rigging crew. MCAAP supervisory staff alone is authorized to supervise the MCAAP rigging crew.

· Manufacturer staff will provide supervision to their provided manpower to ensure they are ready to assemble the grit blaster

· Manufacturer will be on site to offer technical advice for startup.

· MCAAP will provide building utilities to the machine to connect to utilities pre-installed at the factory.

· The 12’ of HD duct work to be provided by the manufacturer

· Manufacturer will provide 10,000 pounds of GH40 grit for run off and grit blaster start up

· Recommended spare parts to be provided

· Delivery to be expected 26-28 weeks ARO or signed award

· MCAAP to provide after award, Bomb Cases and Trolley assemblies and Hangers.

· Trolley assemblies and hangar assemblies will be provided by MCAAP when the contract is awarded.

Detailed description required prior to award The MCAAP Engineering Support Division will validate and verify/approve the Contractor’s listed equipment concept before award is granted. In order to meet this review requirement, the Offeror shall submit with their proposal a detailed technical Description of the grit blaster. The Offeror’s Description submittal shall account for each one of the required product features located in this Qualifying Statement. The Description shall also clearly portray/describe how the grit blaster will function. Conceptual drawings are required upon contract award along with a 3D model to verify compliance to all design requirements. Acceptable formats for the 3D model are SolidWorks (assembly/part) file, .step, or parasolid (.x_t). Final Drawings will be provided showing ‘Pickup Points’ for Venting on the Blaster.

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